MOLLTTSCA OF THE ' CHALLENGER ' EXPEDITION. 229 



the outer lip. Outer lip advancing a little on tbe edge of the 

 base, bending outwards and a little patulous to tbe upper eari- 

 nation, from which point it runs straigbt to tbe outer lower angle, 

 flat across the base, patulous and slightly channelled towards the 

 point of the pillar, which it runs beyond. The generic sinus is a 

 mere open concave curve. Inner Up crosses the body more as a 

 polish than a glaze. Pillar perpendicular, white, with a slight 

 twist, narrow, and with a flattened and patulous rather than re- 

 verted edge. H. 155. B. 0'47, least 0*46. Penultimate whorl, 

 height 0-23. Mouth, height 0-25, breadth 0-23. 



This species is in form very like T. conspersa, Ad. & Eve., from 

 the "China Seas;" but that has the lirations equal, the whorls 

 are more angulated, and the angulation is not formed, as in T. ad- 

 mirdbilis, by a thread, but by a swelling in the whorl itself. The 

 sculpture extremely resembles T. bicolor, Ad. & Eve., " China 

 Seas;" but that is in form very much more attenuated, has the 

 suture much deeper, and the individual whorls are higher in pro- 

 portion to their breadth. 



9. Turritella (Torcula) lamellosa, n. sp. 



St. 162. April 2, 1874. Lat. 39° 10' 30" S., long. 146° 37' E. 

 Off E. Moncosur Island, Bass Strait. 38-40 fms. Sand. 



Shell. — Like a Terebra in sharpness and slimness, perfectly 

 conical, angulated at the edge of the base, which is flattish, with 

 a strong, concavely curved, open, labial sinus, thin, translucent, 

 and very pale-coloured. Sculpture. There are very many close-set, 

 distinct, curved lines of growth, each of which is produced into a 

 small, thin, sharp, appressed lamella. Spirals — above each suture 

 the superior whorl projects in a slight rounded swelling, which 

 slopes gradually outwards on its upperside, is slightly angu- 

 lated at its greatest projection, and there defined by a fine thread, 

 from which point it is suddenly, but not quite sharply, contracted 

 into the suture. In some specimens this suprasutural swelling 

 is very slight, being checked by a shallow open constriction which 

 lies immediately above. The rest of the whorl is covered by a 

 series of fine threads and shallow open furrows, 6 to 10 or 12 in 

 number, varying much in strength and distance. Besides this 

 larger system of sculpture, the whole surface (lamellae and all) is 

 fretted with the most delicate microscopic spiral ridges and fur- 

 rows, which are faintly crimped longitudinally. The apical whorls 

 are pretty sharply carinated and angulated about the middle, and 

 are otherwise almost perfectly polished. Colour yellow ashy 



